Itu caranya gimana ya? Mohon bantuannya ya kaaak?

saya coba bantu.

105 + 3b = 180.
3b = 180 - 105.
3b = 75.
b = 25.

3b = 3a.
b = a.

25 + 25.
= 50.

jawabny 50.

cmiiw.

3a+105° = 180°
3a = 180°-105°
3a = 75°
a = 75°/3
a = 25°

3a = 3b

a+b = 25°+25°
= 50°